Owning bullion that is in someone else's vault is - IMO - nonsense.
If you buy, get coins that you can keep in your own possession (I favor silver, although I possess no gold or silver). When the ball really gets rolling downhill, you will not be in a position - IMO - to retrieve your gold in some foreign vault (nor one owned by some potentially-folding banker in the USA, where Martial Law is a real possibility).
I am completely broke, so take the above for what it is worth.